Organ vascularity and metastatic frequency

Area of Science:

• Oncology
• Medical Physiology
• Cancer Metastasis Research

Background:

• The hemodynamic theory posits that organ metastasis frequency is determined by cancer cell delivery via arterial blood.
• Previous testing was limited by the lack of reproducible, noninvasive organ blood flow measurements.

Purpose of the Study:

• To investigate the correlation between organ blood flow and metastatic frequency in humans.
• To test the validity of the hemodynamic theory of metastasis across different organ systems.

Main Methods:

• Correlated metastatic frequency data with organ blood flow measurements in patients with primary cancers from 15 anatomic sites.
• Analyzed data for 10 organs, considering organ weight, blood volume, and blood flow parameters.
• Compared correlations for cancers with venous drainage into the portal system versus the caval system.

Main Results:

• No significant correlation was found between metastatic frequency and overall organ weight, blood volume, or blood flow.
• A significant correlation (4-8% level) was observed between organ blood flow per gram and metastatic frequency for cancers draining into the portal system (4 of 5 groups).
• A weaker correlation was found for cancers draining into the caval system (1 of 10 groups).

Conclusions:

• The hemodynamic theory of metastasis shows partial compliance, particularly for cancers with portal venous drainage.
• Further research is needed to explain why only certain cancer types align with the hemodynamic theory.
• Organ blood flow per gram may play a role in metastasis, but the mechanism is not fully understood.